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Finding the Fourth Proportional to 157.60, 215.48 and 153.28

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Solution

The fourth proportional to 157.60, 215.48 and 153.28 is: 209.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.60 : 215.48 = 153.28 : x
  2. Step 2: Convert to fraction form
    157.60/215.48 = 153.28/x
  3. Step 3: Cross multiply
    157.60x = 215.48 × 153.28
  4. Step 4: Simplify right side
    157.60x = 33,028.77
  5. Step 5: Solve for x
    x = 33,028.77/157.60
  6. Step 6: Final answer
    x = 209.57

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.